Name the enzyme that facilitates opening of $DNA$ helix during transcription.
$RNA$ polymerase
$DNA$ ligase
$DNA$ helicase
$DNA$ polymerase
The vector for genetic code is called
Which one of the following is not a part of a transcription unit in $DNA$ ?
$RNA$ polymerase is involved in
: Choose incorrect sentence for $RNA$.
Which of the following $rRNAs$ acts as structural $RNA$ as well as ribozyme in bacteria?